I just purchased a XK8 5.0 Engine Service manual to get a better idea
of how to remove the needed parts. To my amazement the instructions are way simplistic. Like..... see these covers take em off change the plugs go get a beer.
Its preposterous. There are a tone of pipes and connectors on top of the covers. Any Tech that can chip in some instructions would be really cool.

 

Lol I find the workshop manuals to be the same. They skip many steps that aren't intiitive for a DIYer. I like your steps to changing spark plugs. For changing brakes:

1. Remove wheels
2. Change brakes
3. Go party

 

These are 100,000 mile plugs so need changing about once in the life of the car.

DIY should not try this as the plugs sometimes, maybe frequently, seize in the plug holes.

Unlike older engines which required regular plug changes this is now a job for professional mechanics.